APA Style
Das, B, M., Sobhan, K. (2018).
Principles of geotechnical engineering (9th.ed).
Boston, Mass:
Cengage Learning.
MLA Style
Das, Braja, M.., Sobhan, Khaled.
"Principles of geotechnical engineering".
9th.ed
Boston, Mass:
Cengage Learning,
2018.
Computer File.